Effect of nonlinear advection on the Indian Ocean diploe asymmetry

• Published in: Acta oceanologica Sinica Vol. 33; no. 1; pp. 77 - 82
• Main Authors: Wang, Yu, Lan, Jian, Cui, Fengjuan
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2014; Springer Nature B.V; Key Laboratory of Physical 0ceanography, 0cean University of China, Qingdao 266100, China
• Subjects: Advection; Asymmetry; Climatology; Dipoles; Earth and Environmental Science; Earth Sciences; Ecology; Engineering Fluid Dynamics; Environmental Chemistry; General circulation models; Heat; Heat budget; IOD; Marine; Marine & Freshwater Sciences; Ocean models; Ocean-atmosphere interaction; Oceanography; Precipitation; Radiation; Sea surface; Sea surface temperature; Surface temperature; Temperature anomalies; Topography; Wind; Wind stress; 不对称性; 印度洋偶极子; 平流; 海洋模式; 海表温度距平; 非线性; 风应力强迫; Indian Ocean; China; ISW, Indian Ocean; nonlinear advection; dynamical effect; asymmetry of Indian Ocean dipole; heat budget
• ISSN: 0253-505X; 1869-1099
• DOI: 10.1007/s13131-014-0420-y

The asymmetry of sea surface temperature anomaly（SSTA） amplitudes between the positive and negative phases of the Indian Ocean dipole（IOD） are studied.The dynamic effects on it are analyzed using a hybrid coordinate ocean model（HYCOM）.It suggests that the IOD is still asymmetric even when forced by a symmetric wind stress,and the asymmetry of the SSTA in the eastern pole is strong while that in the western pole is almost insignificant during the mature phase（September–November（SON））.Thus,the IOD asymmetry is primarily caused by the asymmetry in the IODE.A heat budget analysis is also conducted for the mixedlayer temperature in the eastern Indian Ocean（IODE）,which indicates that a nonlinear ocean advection cools both the positive and negative IOD events.Therefore,the nonlinear ocean advection is responsible for the asymmetry of the IOD.